Download or read book Evaluation of Recurrent Selection for Combining Ability Between Two Partitioned Populations in Maize written by Gregory John Holland and published by . This book was released on 1991 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Progress in Recurrent Selection for Specific Combining Ability in Two Open pollinated Maize Zea Mays L Varieties written by Ronald N. Walejko and published by . This book was released on 1976 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: To decide upon the most efficient breeding and testing procedures to improve maize populations, the plant breeder must have adequate knowledge of the type of gene action involved in yield heterosis. Two types of gene action have been postulated to account for yield heterosis in maize: dominance and overdominance. Recurrent selection of specific combining ability and for general combining ability have been proposed as methods to improve maize populations. Recurrent selection for specific combining ability uses a narow genetic base tester and originally was proposed on the assumption that overdominance is the main type of gene action responsible for yield heterosis. Conversely, selection for general combining ability uses a broad genetic base tester and assumes that dominant, favorable factors are concerned in yield heterosis. A procedure was proposed to compare the relative importance of dominance and overdominance in yield heterosis. This procedure involved recurrent relection for specific combining ability in two heterozygous source populations with a common inbred line tester. The purpose of this study was to evaluate progress in 5 cycles of recurrent slection for specific combining ability in two open-pollinated maize varieties and to determine the type of gene action involved in yield heterosis. The two source populations were the open-pollinated varieties, Kolkmeier and Lancaster, and the inbred line, Hy, was used as the common tester. After 5 cycles of recurrent selection, 6 population (C0 to C5) from (...).

Download or read book Evaluation of Two Maize Populations After Eight Cycles of Reciprocal Recurrent Selection written by Thomas Craig Kevern and published by . This book was released on 1981 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Progress from Full sib Family Selection for Potential Yield Improvement in Two Tropical Maize Populations written by Samuel Cephas Muchena and published by . This book was released on 1977 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Tolerance to High Plant Densities and Plant Efficiency of Maize Breeding Population Developed by Recurrent Selection of Grain Yield written by T.M. Crosbie and published by . This book was released on 1978 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several recurrent relection schemes are being used to improve grain-yield performance of several maize (Zea mays L.) populations at the Iowa Agriculture and Home Economics Experiment Station. Three cycles of reciprocal full-sib selection in Iowa Two-ear Synthetic [BS10(FR)] and Pioneer Twc-ear Composite [BS11(FR)], seven cycels of reciprocal recurrent selection in Iowa Stiff Stalk Synthetic [BSSS(R)], Iowa Corn Borer Synthetic #1 [BSCB1(R)], and five cycels of half-sib recurrent selection in Lancaster Surecrop 9LANC) with maize inbred, Hy, as tester have been completed. I grew testcrosses of unimproved and improved populations of BS10(FR), BS11(FR), BSSS(R), BSCB1(R) And LANC, plus population crosses (i.e., CO X CO, CN X CN) of BS10(FR) X BS11(FR) and BSSS(R) X BSCB1(R) at three plant densities in three environments. Testers were maize inbreds Mo17, B77, and B79, My research was conducted: (1) to evaluate respones to plant densities of the CO and CN populations, (2) to study changes in several morphological and physiological traits associated with recurrent selection for increased grain yield, and (3) to caompare results obtained for testcrosses and populations crosses to evaluate combining ability for grain yield, density tolerance, and physiological traits. Reciprocal full-sib selection did not improve the response to plant densities of testcrosses and population crosses of BS10(FR) and BS11(FR). Furthermore, selection did not increase grain yield of BS10(FR) X BS11(FR) at 39.5 and 79.0 M plants/ha or of (...).

Download or read book Evaluation of S1 Lines from Original and Advanced Populations of Two Maize Varieties to Determine the Effects of Reciprocal Recurrent Selection written by Kathleen Ann Grady and published by . This book was released on 1980 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Maize Populations Resulting from Divergent Recurrent Selection Under Interseeding with Red Clover written by Mohamed Farah Shirdon and published by . This book was released on 1993 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Maize Populations Developed from Different Recurrent Selection Methods written by Ken Alan Mayberry and published by . This book was released on 1992 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Some Synthetic Maize Varieties Established from Reciprocal Recurrent Selection and Diallel Populations written by Yit Yuan Yong and published by . This book was released on 19?? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Five Cycles of Recurrent Selection for Cold Tolerance in Two Maize Populations written by Kathleen Gehl Hoard and published by . This book was released on 1984 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recurrent Selection Methods for Maize Improvement written by Larry Lynn Darrah and published by . This book was released on 1977 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of 11 Cycles of Reciprocal Recurrent Selection in BSSS and BSCB1 Maize Populations written by Vichien Keeratinijakal and published by . This book was released on 1990 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Response to Full sib Reciprocal Recurrent Selection in a Double cross Maize Population written by Eduardo J. Graterol M. and published by . This book was released on 2005 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Reciprocal Recurrent Selection Composites for Combining Ability and Phenotypic Variability written by Anton John Bockholt and published by . This book was released on 1967 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recurrent Selection for General Combining Ability Based on Inbred Lines Performance Per se in Corn Zea Mays written by Syed Mahboob Ali and published by . This book was released on 1965 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Single cross Selection Methods with Simulated Populations written by Bahman Ehdaie and published by . This book was released on 1970 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Recurrent Selection in Leaming and Midland Maize Populations written by Marcelo Javier Carena and published by . This book was released on 1999 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Favorable responses to selection were observed in traits that are essential for adaptation, especially in root lodging. S1-S2 recurrent selection was an effective method to adapt and improve both populations, suggesting an adequate balance between the selection among S1 and S2 progenies. Intrapopulational recurrent selection was also successful in increasing the heterotic expression between Leaming and Midland Yellow Dent. The first objective of our long-term program has been achieved and considerable improvements have been made. An alternative U.S. heterotic pattern has been confirmed and needs refinement, and an interpopulational-reciprocal recurrent selection program including improved selection cycles of Leaming and Midland Yellow Dent seems desirable.